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Abstract
Intrinsic Josephson junctions (IJJs) with lateral sizes down to submicron have been fabricated in high temperature cuprate superconductor Bi2Sr2CaCu2O8+δ single crystals. With in-plane magnetic fields applied perpendicular to the short edges, equally spaced current steps with intervals up to millivolts have been observed in current-voltage characteristics, indicating that terahertz oscillation has been excited in the junctions. The one-by-one switching to the same resonance frequency will make possible to employ a submicron sized IJJs stack as a building block for solid state terahertz continuous wave sources.
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